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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ec2d82b94f42830eeb7f20f4b8f2c0c032eea74f9a9f68f45d0cf4f56df3aa' 
  AND token = 'zFlY4wfAJcVAok6eX39KQ4YQgOBiWyU1ZmYAVCiETdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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