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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c07926d348b841f4809c2fd4709e058c63c6282e3970a5c47b666843b70352' 
  AND token = 'Kdr85ye4EHeFfuOtMkjFo+n6Py/sGaj3hBpX9pKgwWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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