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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55203cbb032e8f536d07b5f38f126440101b8d422b240cda21ba97b6237f1176' 
  AND token = 'J2UNJ4jx74dwdHTlUj8oAmJYg0+b2Bk0uRYF+vQcWq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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