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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7ce5cf4c7b9cc514e404f2d384a1f660b227813329e62be0aaae6a242856379' 
  AND token = 'KuDRr+TvWAOOkxh/WxzjR6sY5f9djQMnp8sY8T/+Ta4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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