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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8569c9b1dfd2fcf8c0774c5e343d17ba80cc52c2fe4d27b8f1cde0e3274585fb' 
  AND token = 'ZS+yhwzsgRj59QduqHQeASTbiRNxbmE+dLekrbCnvhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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