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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f546641596e0c29dcca84b65ab093c8b77ed4e6c826b5a203f417ccd17dfa6c' 
  AND token = 'ZEdJCmmrwgrImBERRMRkX1dMTW/2gO6hmetxFiP5BJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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