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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3360740bff4b2034e10c5e0904d541044363342ee3ce2ab84565ad9be6d3ab2e' 
  AND token = 'aitKyXvSfLJlbrTVFoAdfQ2SZFcGbM4fF8GeQIaKIL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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