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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79524b03a675ff1f46299121a707cb06d642d8bd6b157897868be13412ad9cae' 
  AND token = 'PypWbtyNcjoHJB4W3Sqs0wPNgMt+n785CsMmoV4eY+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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