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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa1bc50a275df317e72437e76d09a34f5558815a40a13a9b6df9f5dc734268c' 
  AND token = 'nHOCaAmf3phflsMXw7Pyr9SPxpbjAoqh9SeQxGzgjUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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