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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ccb0f6a3f3d3016429555c9f3dd1606bc2f1d52672e04cc93aba768d2aa13ae' 
  AND token = 'LM1Iyl8kDOzLW7y0CXUVcaimhItH9HpVcFLyad58J8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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