SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0558f746c61b96bc6a3fa2ca23caeb0932187a6cc55bbafdb53f028871e25cf4' 
  AND token = 'FPvAheTj3hHIs/8TTZzXpGlrQr/1qwauZ/awuqS38Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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