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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf366a16f912e560014ddd3a737cec60126e3c0d0c4c0fc562dc06a5205fcfa' 
  AND token = 'q29FNLI8uiOjJ1WVwd/Zrkk3o+KS1N8dHdwiuMqxyak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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