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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b446e62578a19160b4f5171489ba3875ed662b6d7176853e0b4121eda5a4d3' 
  AND token = 'wxoMn6S0r/Ud+gmH9QFSgFJDjXEiS6DJM78JPwNJn/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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