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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb124027d5ba927a7777536c3ff67ce190221dcf55681ad2ad5c4e74154fbf04' 
  AND token = 'wdFWz95r3ivIPTP6vOl5K8pJzDcG0dLC/MPuwKOHPXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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