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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970b35fdff8e65881a74bcb5b2119e9d86d0dc95829476c07834b2163cc13a39' 
  AND token = 'xtY4XRVM+0eUbQkO0IItLaIpUgMXLJiwPj6bEBKbOpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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