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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137f5aeb20ce175d606e97bf47cce712485e98ba8a6b6f8b87920f1ea274a982' 
  AND token = 'EUSs/GxG+UhZwIcJZLrB6t2M23Mrt4mIP3BSHEy9Gfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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