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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b22a94350b9a4aa0c2b8c291ae177122f3eb208a69e6109f7c79f0f3b77d6d7e' 
  AND token = 'PDTWxUFfSeQ7WCttJmGE6ktkp73GMCJHEvOn//WRpX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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