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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530974e6e0be855179a72b781908df98ea926360801046fb73c5a8eaea501ef9' 
  AND token = 'eTZhCr0wPn7lkyQ02qlwLWqi2M6bC+n64jBiFddADWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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