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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31672ff04609d8bf03f1af34078b7ef0e4eae326c5b8db750bac0f9ac4586f23' 
  AND token = '26Vh33iztK6OE3K/85At7zMWgqZClrZ2c7o+SHDhGEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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