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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00320194c2ee088f3482e0b37e2b3f75f16ceddc00911f68b4f0a77629cf7acd' 
  AND token = 'GUMp5UHgaQ/L5dJCenrlaounEKtt8TrN38eLjFa9qhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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