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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031586fa27a12d63e4a3ef6156a833e9d06faf6fb422bd48709e21aad765d424' 
  AND token = 'ZeqRibVSxmEPhK0SMjdow02GKlqA8uTAJcf4f7nOD80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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