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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b5bc212a7ecc54b5ca8fad9ffa111c201f9b8b2455f6f3af4c235602bf0fa9' 
  AND token = 'Mt0FSLWos3t4Relm8lte2tnwho4YcEzb0ai5k8QspC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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