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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '944589e507a1595e679709ba8d83b2964009e278c5ae54fc5d190dfcb2b318e9' 
  AND token = 'Oi7cX1FrS9ST+n8UuV7B7N3yQ2hVvRQcAbLhNEPRYiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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