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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88860be0d1129b66e7dd372ae69f39da5a7f1166b99379c8072fe0b5cbe5ffa7' 
  AND token = 'KEG/AQoHULrxt3LiKITFTA/asfhXxMxgxvSix5TRWgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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