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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3502ab91af4c1471df224aa88f7e55c1b06b9c3e950638789ad78fe5decfc3f1' 
  AND token = 'Fiwdmcw43cWF1z11cHYv2fqCS2TiLcc0mJi78o1v/Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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