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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db1309e0b7c6fbb9f5b38ae980939ad525a0218f80f24c952d9667efe58764b' 
  AND token = 'EErBGuA6x/5OP59jfpZpUuQ7U+kIOHOG+BmH8iGiw9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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