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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b34cb8a1c99a677e38353214a25f5a2f104f5f266c4c9a60073c14428542cba' 
  AND token = 'BmeH8xdD/yhJ2o8CHwgXxMMDJ98ebLVcUD1ZmopZxno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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