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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab22c1bfe49f39d1f427030d8f6b4edc1dff417e5cf18d44a6c09ac9d72e8e9b' 
  AND token = 'cNqVcZsJqQ8VZxL+ZzWu6L82ZJH9hs2BiNexNUTi51Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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