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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a01904ee8a5ef420f2a5175bdf39546cfdcbc754fae00e68b2425146dda6c5' 
  AND token = '4CqwmMgyeSTj5SukUhq4HXxN2rsiuHGxLQQe/wkxh2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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