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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a60e981c36ae9e4684988ad5ce7c9c7f84d73d5299c719b2674b3b2f42fc7d2' 
  AND token = '44V9A9uF2IZvhz5rEftjvRDSUmM5JFDk1dJRxzglJZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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