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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db58c97a21af0d2b7e7bbed6759220c5a31368397f1b0c1e32921569c975a34a' 
  AND token = '8z29ho3+kpBpqH+3UkWdUksqxhQj5AK2HHSZNgchlfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}