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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85e8b6f5cadbab75c5c5df6ef34e70e04880cea4392935950a6e000e105adb5b' 
  AND token = '7m7QVol5mUCDAQMel8BqZjtQpThX4cdh+Mx5trWfhUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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