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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c975a8040c6854dc0592d9e3f08128b08ee4893f0b2300bbf8fef670a592e8b' 
  AND token = 'u+V4evtTzobmuZ5sgqmGyNShfPa0FyT/QvTh5LLa+pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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