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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73681cf5671db19720a6d1d829acb3577bf5730378af95aadd91999f32bb7988' 
  AND token = '/s9GA+0UQtdHjwM+57/Avu3blopG/5tgXHrIVrCMs4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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