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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf21167b2be1a04e251d3cfc5f22f5c89f97d754ece5e4ab2d15f017d9747cd8' 
  AND token = 'Zk2c+Gfppl09b5sgacIBQ4SO3ESe+yZZ/MWSt9123zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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