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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eb9fd46252a14523944906bef91d6e1d3487c3882709b5b19ceb8e9f0752ad9' 
  AND token = 'Z4dvdDitCFwwAjN+i8DiSqGzqpS3SwiGNeXkLoRpg4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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