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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1cb04c637bfbd669b96539d474e87ff2cfbf6d2daf257c07ec6a2fb30f2a8f1' 
  AND token = 'a/8kd2jMnzZfRLDN4eOWY7BBbhdfpXAZ/51AuH6Vrb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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