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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98e99d3c96dc8a8de42d08b327102052e52a77fe86591cf7e725ea2fc5e9e1e0' 
  AND token = 'r9Hdf4A7lVx3yOPsUncPaJs7WbsFpxcXoY+bumydXVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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