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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23607eab37a6d6ba2f7c88ff43684dd2ba1cd659f50ea22c87d042239f23927' 
  AND token = 'V7CiBFn2tnlMtdbhwJ63O11TeC1ndp21kmy/A0hFmMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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