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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec574e74823589d7860037a15e2832d5e2c7b056a7f33da2d464de435c1abdd' 
  AND token = '0+uJImNSb+b+vnHaMWFLccv0CoChubqVcc2Mq/XYU+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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