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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd365e3ecfd8d7507d497a65127cacaf824a66ee048561a25a1e31d6a0c8c68' 
  AND token = 'HaR7PDXlXAzE6JcaXyoXNslK5Nl7SWdSaygyW98xitI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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