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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7688db98758bf7fad78e09a53fa49bc2ad351166da8d664c8a235ba7dd3f6fd4' 
  AND token = 's7GfBcy9GocGXKVvAfFKKma4Wmts88ndSAOz0WSn3tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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