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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03bd1a7bbaa5447303c2bc48ed3b7a6fb7aebd3b8d635b35762d571f31c6ed35' 
  AND token = 'Q3zz+QjLUMUWeHj5hcRcC43Sw8HyD/8Px4cskDIoJIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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