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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc2ba85be7e7fa4f5f8e313b67b64f46d6642f86c3d7e275d9cd930fb5f2415' 
  AND token = 'EUu5zLAXnOGiWXvp9qxH/sIrp7Mp2cVwPTcL326OHjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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