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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4539dab66698f19868ce40ccf535675b7fabd4394f2063dd91d80b51c678f812' 
  AND token = '47Q220M8RTejR32a1SqZZJx4CEOqpHHJUASU2oXKApA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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