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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b2777c6ac30fcb633c7dece8678aab342c9a05e753281bee0bddda7c6ab7881' 
  AND token = 'lDoT8KULJZYHv3kdf0QLLZOpj2zL7R7NA7OgJHO/F4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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