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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08dc1f95273d6c36e2985ad4b0276407bc8ba34a1225c76cad8d71c9f18d1316' 
  AND token = 'E58MModQzj5QX79TtspBeFMlj8JHQuJSYYSfESiXAnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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