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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ad04fa8b05f993bad7dbc46dd2282e6d50db3df6b389b9bfe3dd2d7c4763e6' 
  AND token = 'Ab5AS0sm3qynXMJ//KVjA4AK6RukSBcFggUATUzLuoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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