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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a38db87c0958e7f7ded111d6e32619956a49a897a90bf9ebc1ec0dfc70df41b1' 
  AND token = 'klXxxaDyu4KmTv4umv9U2b+xh2kq+EkEdsgYHYyBpM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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