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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '589d4b037820b01e74aef261cb80e3d0c01af6e85be65ea07857d75011024956' 
  AND token = '+WCAAHYgIYjV0sWeb/Z8mt2WE8s1L3T9xizj/ZSZ4jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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