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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '703823efaeacae9a469e60d4e1cdda996d03e777e0e719dc08ad012d8cf45366' 
  AND token = '5JCNQ4PULQblpE8w8EehZDBDSxbcCK3xcpmMdAgjL6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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