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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82702e2c46f9425fe5e0c4e6c55a2b68428e7c61473545efb4a659368e247eb' 
  AND token = '0w6Sq/lqYZm0WH2TVtz1FHgJy4xrOp08l4xIiHkt0NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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