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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f57152fd192bc2a19bb7d2576a185125f989f391517db7d474c728e3ee86ca' 
  AND token = 'M8damQB24QXD0fIZ+a4N62YaVJ0LRh6iINmx5ZhEWyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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