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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c02336808da062271898a301e18b1ae5123e714222d8d6feea546af7512e3c' 
  AND token = 'zkbnKea8g0Tkt9sJNZXgqpd/9QD/7Fk/wPU8wAApzrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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