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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c5208312ab2ca72cce0738e452d8ae5197c9083fdd2a476178c04a0d1bcfd58' 
  AND token = 'WNrOGiAWYoXeSE0/l4VX9ItrKy35rUMO2M0W7pBrj24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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