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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031502117882bbe87a249dd88f86afb12a2ed95003e530f1b6dedab7f8116cf3' 
  AND token = '6OaLMQdDHcOOQZNmp3GULAXqzRR8G91MRH/LLE4WNtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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