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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a7c25db83fd7a9a7b2f8f1ebff17b68a95e7fdb0ff8205e0d026098d46cb01d' 
  AND token = 'lSEka4n5PCsRspuTsu1uQ5WXt44jRtl5RWLRQ3O7Nxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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