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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503658423b2582c288e016895dd4fce79cf4a56802993c288177c01e15ae92e0' 
  AND token = '3q7FWMfUjtJ9XnB+yPn/ob6tO6+8mtST+PTZOz4rL9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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