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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '302e15f0fcfd34720c1d96d8199a2b5d81098faf73fafc9e89c25f00ec00f75b' 
  AND token = 'Q9wC8eTejPR0fgs0hMSZTQOQqvrYpLPXsBR3j5gg3cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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