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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96367f963fc9b57972d3a23f350aa1fcdc8ef1a5e8451b7e82ea0a7c81127449' 
  AND token = 'WG0RZeVryEErMD+Muv6I+tvvxIXmc6g1J0XzPtoJ8AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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