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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690a9390ae1329b627a03dbd03559ba117a749119c50bc35a4c2a559b6ab0185' 
  AND token = 'OgtKVz+LA6E3J7l90Nakpkyt4I7HZfsYc8ic5WdOT8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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