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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b5d8f5eb4fad322917091f6d8896424ad2e6720de6c85a2cfc578e43cf8c3e' 
  AND token = '+pX7doSgdoYNHzamiB1uCXalfgjbpvdADn8tAcYrH7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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