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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '561e13a6a71edc590aaddbad59ecaefa341df9d98ffb9d5c599bf94cf069ab4f' 
  AND token = 'i8p9xGGe9XABey2eXEk+75EMjJmkTMpmtxRSC6lYo5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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