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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74bc36eb8104858527d1f40762cee91876894234343540b876276c69b2b38e52' 
  AND token = 'a15TR92IQjuqMjeFtCc07UuiTqRrfJ09ZHt+jD0XJug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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