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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3365546fe0e28f7b4e83f9572a07f929b33fcf3d840ec32783c7204423453b7b' 
  AND token = 'nzKfz4BWOp6qfRFftoCN/EG2xL6N7/mkE10XXJAkpf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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