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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ff30c6180490b4b8715dca101dee60c3c2f8de76754eca2a2c3945aaba05e1' 
  AND token = 'ASVJZEfFAhWRb5Ghe5F919OclwmgCcC/1rgW4xD7hbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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