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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e94e169ece8dd262a4c71db5f5d1b96b8b13f34cfba95e82f33975d7e880c35' 
  AND token = 'axc9QZ+i5jkwnz1PdX9LUa9VfThTQSIRo5jHyUl/B70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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