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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea37b3967e6d7d94ff20fc50ba7b956f3b76135c05480edf5ba24dd9754f7c60' 
  AND token = 'yGzpSyaiMAueeGN85ewUHz2mYsqawb6q1nxJyKgbbh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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