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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e70571e0e6a907660478bb2418b105fada3893fd4348db87c2fb0f65dc284ad' 
  AND token = 'xBQ33wIpp7CemHE1rghvNzKnif9mzDtNV5esKPxUDG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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