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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2383c4f67d71c3f59e40c88df0267cfccfd127a92c7903e255a5f06ae7c469b' 
  AND token = 'Lk/4UsrlFO6Jqs6K0vVBOeYJ4468+0W7KV0m2lAmG5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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