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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0071dab8a1643b81aee988ed4a26c179b45d52b763cf08e0b25d180a926c1e9' 
  AND token = 'KQHkgJU0vm23gCwiwKcnFbHd8Iw9kWLnljk+v3/dwr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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