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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd139c270a2337ca06f220f3d190f0c557f38ee1c724086a1e0a7ddf4f42306' 
  AND token = '4HHaaSiFHYubeXWaeKWsQBxPDxz6OtRAoTQ2GVwg1iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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