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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91472aa523e29a20bf3c557d46a5fe6cb7285dbee383ead7e40fe6c5e94d494c' 
  AND token = 'BwaBWE+04EnJB9TNymfJSUDHVeJ1qyrazNUE1cM7ucg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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