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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d4d334fe51188353417b152ee9ba5a39b095bc35d4cb0893258d3579dd4ac5' 
  AND token = 'Ha9BGht8LF4NLrstGP91F6A7ETrZL1KpPVGNUUkn/Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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