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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dedbb78fdad09db507f9e299534531bc1806d14fd3264d2ce1f73e1f4e0f8a19' 
  AND token = 'idaJFFReRVuOvVgsWOvm23eZR/r5B1zoiqroox6Daf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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