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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f61dab21cd9f004baf6405b8e8c1921deacb2d4e47c8eabaf439509a3cd3e18' 
  AND token = 'ylnOmyjGI1LSqxOolq9omh33jHmVrgjedmfKDwHVS5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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