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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc24d7bfe442b3783202b2600f25db86c07d9c225be668203ac2b34cd0142314' 
  AND token = 'hZt5Fx1mATW1mxbpjjVpBHZ27PoIZIIy0yes2WhHlgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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