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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf1ff67bce776b798723b750dc316670f1f2e340cf30b3757a28534320d7d72' 
  AND token = 'Gg/tNbxk8ZOoGv/3JgJb9+RVCDR7DfZq8AqcG+3xVeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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