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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaed3d0ff8018fd8c8e14e6a521173f95cf7890625dbd2d543dfa7eb9f0d6ddb' 
  AND token = 'hFZ19xmc9Yh84OrJL6puN62WgA+AMV9YuRVvUtARS48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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