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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfaed1706c60055311d2b3ace27a2a0feec50e5f484967417844d4bcdc143eae' 
  AND token = 'KnF5cQacks/WHGp9M7Nd2n29Y6tQctQ135NdEnrWZ9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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