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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e3c9765717ea685d2a9a2d28cb5aaa9e89b43c84b674f3adff99a40a75637d' 
  AND token = 'Jlpu2t/1CG/T2Y8jjXeAyGDfnyvAPRv9MudgvQ7RCyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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