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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1029094af31e474b26cd188f34ffd852a04b3a2d7b45d19c9179c94bbb6189cc' 
  AND token = 'VAwo7xBt0UwdToPXt/0gtZP4I+RTpPGhbwtR+eceT1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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